STMicroelectronics STM32L476QEI6

Overview

STM32L476QEI6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB flash, 128 KB SRAM, USB OTG FS, LCD controller, and integrated SMPS support. It delivers 39 µA/MHz in SMPS-run mode, 420 nA Standby with RTC, and supports capacitive touch sensing for battery-powered industrial HMI and portable medical devices.

For engineers reviewing the STM32L476QEI6 datasheet, STM32L476QEI6 pinout, STM32L476QEI6 application, or STM32L476QEI6 equivalent, key selection criteria include ultra-low-power runtime efficiency, integrated LCD driver with step-up converter, dual 12-bit DACs with sample-and-hold, and hardware-accelerated cryptographic peripherals for secure edge node deployment.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and dual-bank flash supporting read-while-write. Its power architecture includes three voltage scaling modes (VOS0–VOS2), external SMPS interface (VDD12), and FlexPowerControl logic managing 7 low-power states including Stop 2 (1.1 µA) and Shutdown (30 nA).

Peripherals are routed via an interconnect matrix supporting concurrent high-bandwidth access; clocking uses three PLLs (system/USB/audio), auto-trimmed multispeed oscillator (±0.25%), and independent analog supply domains for ADC/DAC/OPAMP/COMP to ensure noise isolation in mixed-signal operation.

Key Specifications

Pinout & Package

STM32L476QEI6 is housed in a 132-ball UFBGA package (7 × 7 mm, 0.4 mm pitch) with 114 fast I/Os - most 5 V-tolerant, up to 14 I/Os configurable with independent supply down to 1.08 V. Pin functions follow ST's standardized alternate function mapping (AF0–AF15) across multiple peripheral sets.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L4R9ZIJ6 and STM32L562ZEJ6, the STM32L476QEI6 uniquely balances ultra-low-power operation (39 µA/MHz), integrated LCD + touch, and cryptographic acceleration - making it optimal for space-constrained, battery-operated HMIs where display integration and energy efficiency outweigh raw memory or security certification needs.

Availability

STM32L476QEI6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial HMI panels, and portable diagnostic devices requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L476QEI6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and secure firmware execution - especially in portable medical, metering, and industrial HMI markets.

FAQ

What is the maximum operating temperature range for STM32L476QEI6?

The STM32L476QEI6 is qualified for industrial operation from –40 °C to +85 °C. Extended temperature variants (e.g., STM32L476VGT6) support up to +105 °C, but the QEI6 suffix specifically denotes the 85 °C grade per ST's ordering matrix and device summary table.

Does STM32L476QEI6 support external memory interfaces?

Yes - it includes a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, and NAND memories, plus a Quad-SPI interface for high-speed serial flash. These are accessible via dedicated address/data bus pins and configurable timing registers, enabling expansion beyond on-chip memory limits.

How many independent power domains does the analog subsystem use?

The analog subsystem uses two independent domains: VDDA/VSSA for ADC/DAC/OPAMP/COMP (1.62–3.6 V), and VREF+ for internal reference buffer (1.2–3.6 V). This separation prevents digital switching noise from degrading analog measurement accuracy, as confirmed in Section 3.9.3 and Table 26 of DS10198 Rev 11.

Can the LCD controller drive a 4×44 segment display without external components?

Yes - the integrated LCD controller supports 4×44 multiplexing and includes an internal step-up converter capable of generating up to 5.5 V from a 3.3 V supply, eliminating need for external boost ICs or charge pumps in standard segment LCD implementations.